/Engine/Source/Runtime/CoreUObject/Public/Misc/PackageName.h
Returns true if the path starts with a valid root (i.e. /Game/, /Engine/, etc) and contains no illegal characters.
true if a valid long package name
static bool IsValidLongPackageName ( FStringView InLongPackageName, bool bIncludeReadOnlyRoots, [EErrorCode](API\Runtime\CoreUObject\Misc\FPackageName\EErrorCode) * OutReason )